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OpenStudy (yeval76):
Eric has been donating books he no longer needs to his local library. After 3 months of donating, he had 157 books left in his room. After 8 months of donating, he had 102 books left in his room. How many books per month did Eric donate on average between months 3 and 8? 31 books per month 18 books per month 11 books per month 7 books per month
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pooja195 (pooja195):
(change in books) divided by (change in months)
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